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The use of Brine is nasty-nasty stuff... It's good for operating down to 0°f as it will freeze at -6°f. It all depends on how low you wanna' go with the temperature. Other secondary refrigerants not including the Glycols are things such as d-Lemonene and if you really want to get cold the use of ammonia can get you down to a temperature of even -200°f if so inclined.
I don't know which is the worst, working om a bromide absorber or a brine system pump. Both make your fancy Snap-On tools look like they were used on the Arc.

ive got a customer who is looking for alternatives other than glycol for
a lower freeze point in the water that they are sending down into a mine aprox 4000 feet below the surface. its currently being used to cool the rock(high water loss) and when completed(at 7000 feet below the surface) to cool the mine.
they dont want glycol going to their treatment plant.

Wow!!!! 7000' in a common supply/return chill water system equates to over 3000psi static pressure. Before the huge French goldmine in the Dakota's closed down, they had several York screw chillers at the 2 mile level where the Geo-thermal tempertature was already around 110°f. The cooling towers above ground with float controlled tanks every 200' to keep the static pressure <150psi. Getting the water back up was a problem as many----many pumps were series to get the water back to the cooling towers. The 95°f water lvg the condenser became 110-115°f by the time it reached the cooling towers. I have nooooo' idea how much the chilled water will be raised using that scenerio but I am certain it will be raised somewhat.
The De-Beers diamond mine out of J'burg So. Africa has many chillers and the cooling towers down at the 2 and 3 mile level where the Geo-Thermal temperature approaches 140°f and chilled water is a must. The gigantic air-shafts pump 90-95°f air down the air shafts where it heats to 140°f Entering the cooling towers. (My tool box and spare parts are still down there...I went down once...I came up.....NEVER again)
To this lowly scribe, I cannot imagine one worrying about the freeze point of thier chill water. If I was in one of the tunnels I don't see the difference in drowning in salt water vs. fresh water though shoud a pipe break or whatever.
Almost 3 miles of pipes full of cold water would be a lot of water fer' sure...
7000'X2-14,000 feet of piping.
I wish you luck on this one....Ya' gonna' need it...

Mongo...You got waaaaaay' too much time om yer' hands...Take my "Gen-3" tater gun using a sonic pulse valve with a 1000yd range firing a lime and see if you can pick off a squirrel or two...I have it in the back of my truck now..